I am using bootstrap and i find the height of the text field is too small.It's like less than 10px.I am wondering if it is small or i made some mistakes.

I used firebug to inspect the text area.It says the height is 18px,which seems impossible for me...And what i got is the same as i got from here.Text area from bootstrap example.It makes me rather confused...
what i got is

OK.I find this helped.But I would be glad if anyone can explain this to me.It seems pretty weird that css properties are exact the same but the outcome is so different...What the !DOCTYPE part has to do with css?!
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GnijuohzFeb 10 '12 at 4:58

I don't know why if I open a clean new HTML5 page it works but after I add some code I don't know why it happens. So I just open the bootstrap.min.css file and search:type="text" and there there is height property and I change it to min-height for it have to be working.